I have a Model 12 with a Cutts Compensator on it that can use various chokes that I may need at the time. It's a great hunting shotgun but it's also the only real "riot" shotgun I have while I'm waiting for another to come in. I bought it used so I don't know the early history of the gun. It's possible that it may have experienced a barrel burst which prompted an earlier owner to put the Cutts on it or they simply wanted a variable choke which wasn't available in the era the gun was made. The barrel seems to taper from rear of the barrel all the way out to the end but the metal also thins out as well. My question is a technical one. The barrel is a Winchester Proof Steel one, not nickel steel which I think is a softer steel. I was wondering at what point in the barrel does it begin to shrink down to the stated choke level that's stamped on the barrel which is "Mod." under the 12 gage designation? I was wondering if the barrel had been cut off before the taper, even with a Modified choke, could I shoot slugs through it without damaging the barrel and using an improved choke in the Cutts or no choke at all?